There were 25 pirates originally and they trespassed into Indian waters at 10.30 am on Friday and tried to hijack a container ship off the coast of Lakshwadeep.
The target ship's call for help was picked up by a Coast Guard aircraft. The Indian Navy's INS Cankarso pitched in for a 12-hour battle. Ten pirates were killed and their hostages - 20 fishermen from Thailand and Myanmar were rescued.
One of them said today, "I thank you Army Indian. I thank you, Cankarso. I happy very much going to Thailand."
The youngest of the arrested pirates is 20 years old. The group has told the police that they were recruited by a gang of pirates who said new recruits had to bring their own AK47s - easy to find and relatively inexpensive in the Somalia black market.
India is not yet clear on how to try these men. Ten Somali pirates are awaiting trial in a Kochi jail, in the absence of any international law to try pirates.